linux-kernel - Re: [patch] video: build fix for drivers/media/video/pvrusb2/

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Message-ID: <Pine.LNX.4.64.0805131050210.20885@cnc.isely.net>
Date:	Tue, 13 May 2008 10:56:20 -0500 (CDT)
From:	Mike Isely <isely@...ly.net>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
cc:	Michael Krufky <mkrufky@...uxtv.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Guennadi Liakhovetski <g.liakhovetski@...gutronix.de>
Subject: Re: [patch] video: build fix for drivers/media/video/pvrusb2/

On Tue, 13 May 2008, Mauro Carvalho Chehab wrote:

> On Tue, 13 May 2008 00:03:02 -0400
> "Michael Krufky" <mkrufky@...uxtv.org> wrote:
> 
> > 
> > That sounds like it would be OK, although something like this would
> > probably be better:
> > 
> >  config VIDEO_PVRUSB2
> >        tristate "Hauppauge WinTV-PVR USB2 support"
> > -       depends on VIDEO_V4L2 && I2C
> > +       depends on VIDEO_V4L2 && I2C && (DVB_CORE if VIDEO_PVRUSB2_DVB)
> >        select FW_LOADER
> >        select MEDIA_TUNER
> >        select VIDEO_TVEEPROM
> 
> This doesn't look to be a good idea, since VIDEO_PVRUSB2_DVB depends on
> VIDEO_PVRUSB2. So, you'll create a circular dependency. The syntax I've
> proposed seems cleaner. Of course, it needs to be tested. IMO, all hybrid
> devices should be dependent of VIDEO_MEDIA. This will help to avoid this kind
> of issue.
> 
> > I don't know if that syntax works for "depends on" , but it does work
> > for select.
> > 
> > if "depends on FOO if BAR" doesnt work, would adding "select DVB_CORE
> > if VIDEO_PVRUSB2_DVB" solve the problem?
> 
> Also, this leads into a circular reference.

Mauro:

Where is the loop that results in a circular reference?  No part of V4L 
or DVB depends (or otherwise has any reliance) on VIDEO_PVRUSB2.  All 
Mike Krufky is trying to set up is that VIDEO_PVRUSB2 should only depend 
on DVB_CORE if the DVB part of the driver (i.e. VIDEO_PVRUSB2_DVB) has 
been enabled.  Without VIDEO_PVRUSB2_DVB selected, then DVB_CORE is not 
required by the driver.

I've been quiet about this issue because I'm not a kconfig expert, but 
you've lost me with this conclusion.

  -Mike


-- 

Mike Isely
isely @ pobox (dot) com
PGP: 03 54 43 4D 75 E5 CC 92 71 16 01 E2 B5 F5 C1 E8
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